<!DOCTYPE html>
<html>
<head>
<style type="text/css">
.separator {
 height: 20px;
 background-color: green;
}
fieldset {
 margin: 0;
 padding: 0;
 border: none;
 background-color: lightgreen;
}
#child {
 height: 40px;
 margin: 20px 0;
 background-color: green;
}
</style>
</head>
<body>
<div class="separator"></div>
<fieldset>
 <div id="child"></div>
</fieldset>
<div class="separator"></div>
</body>
</html>
